diff --git a/src/ckdb.h b/src/ckdb.h
index 88976a4d..4186db66 100644
--- a/src/ckdb.h
+++ b/src/ckdb.h
@@ -55,7 +55,7 @@
 
 #define DB_VLOCK "1"
 #define DB_VERSION "1.0.3"
-#define CKDB_VERSION DB_VERSION"-1.323"
+#define CKDB_VERSION DB_VERSION"-1.330"
 
 #define WHERE_FFL " - from %s %s() line %d"
 #define WHERE_FFL_HERE __FILE__, __func__, __LINE__
@@ -2523,6 +2523,7 @@ extern bool shareerrors_add(PGconn *conn, char *workinfoid, char *username,
 extern bool sharesummaries_to_markersummaries(PGconn *conn, WORKMARKERS *workmarkers,
 						char *by, char *code, char *inet,
 						tv_t *cd, K_TREE *trf_root);
+extern bool delete_markersummaries(PGconn *conn, WORKMARKERS *wm);
 extern char *ooo_status(char *buf, size_t siz);
 #define sharesummary_update(_s_row, _e_row, _by, _code, _inet, _cd) \
 	_sharesummary_update(_s_row, _e_row, _by, _code, _inet, _cd, \
diff --git a/src/ckdb_cmd.c b/src/ckdb_cmd.c
index ff472945..7fab93af 100644
--- a/src/ckdb_cmd.c
+++ b/src/ckdb_cmd.c
@@ -5738,7 +5738,7 @@ static char *cmd_marks(PGconn *conn, char *cmd, char *id,
 	action = transfer_data(i_action);
 
 	if (strcasecmp(action, "add") == 0) {
-		/* Add a mark
+		/* Add a mark, -m will automatically do this
 		 * Require marktype
 		 * Require workinfoid for all but 'b'
 		 * If marktype is 'b' or 'p' then require height/block (number)
@@ -5944,7 +5944,7 @@ static char *cmd_marks(PGconn *conn, char *cmd, char *id,
 					   trf_root);
 		}
 	} else if (strcasecmp(action, "generate") == 0) {
-		/* Generate workmarkers
+		/* Generate workmarkers, -m will automatically do this
 		 * No parameters */
 		tmp[0] = '\0';
 		ok = workmarkers_generate(conn, tmp, sizeof(tmp),
@@ -6005,6 +6005,7 @@ static char *cmd_marks(PGconn *conn, char *cmd, char *id,
 	} else if (strcasecmp(action, "sum") == 0) {
 		/* For the last available workmarker,
 		 *  summarise it's sharesummaries into markersummaries
+		 *  -m will automatically do this
 		 * No parameters */
 		ok = make_markersummaries(true, by, code, inet, cd, trf_root);
 		if (!ok) {
@@ -6012,6 +6013,40 @@ static char *cmd_marks(PGconn *conn, char *cmd, char *id,
 			LOGERR("%s.%s", id, reply);
 			return strdup(reply);
 		}
+	} else if (strcasecmp(action, "ready") == 0) {
+		/* Mark a processed workmarker as ready
+		 *  for fixing problems with markersummaries
+		 * Requires markerid */
+		i_markerid = require_name(trf_root, "markerid", 1, (char *)intpatt, reply, siz);
+		if (!i_markerid)
+			return strdup(reply);
+		TXT_TO_BIGINT("markerid", transfer_data(i_markerid), markerid);
+		K_RLOCK(workmarkers_free);
+		wm_item = find_workmarkerid(markerid, true, '\0');
+		K_RUNLOCK(workmarkers_free);
+		if (!wm_item) {
+			snprintf(reply, siz,
+				 "unknown workmarkers with markerid %"PRId64, markerid);
+			return strdup(reply);
+		}
+		DATA_WORKMARKERS(workmarkers, wm_item);
+		if (!WMPROCESSED(workmarkers->status)) {
+			snprintf(reply, siz,
+				 "markerid isn't processed %"PRId64, markerid);
+			return strdup(reply);
+		}
+		ok = workmarkers_process(NULL, false, true, markerid,
+					 workmarkers->poolinstance,
+					 workmarkers->workinfoidend,
+					 workmarkers->workinfoidstart,
+					 workmarkers->description,
+					 MARKER_READY_STR,
+					 by, code, inet, cd, trf_root);
+		if (!ok) {
+			snprintf(reply, siz, "%s failed", action);
+			LOGERR("%s.%s", id, reply);
+			return strdup(reply);
+		}
 	} else if (strcasecmp(action, "processed") == 0) {
 		/* Mark a workmarker as processed
 		 * Requires markerid */
@@ -6045,6 +6080,63 @@ static char *cmd_marks(PGconn *conn, char *cmd, char *id,
 			LOGERR("%s.%s", id, reply);
 			return strdup(reply);
 		}
+	} else if (strcasecmp(action, "cancel") == 0) {
+		/* Cancel(delete) all the markersummaries in a workmarker
+		 * This can only be done if the workmarker isn't processed
+		 * It reports on the console, summary information of the
+		 *  markersummaries that were deleted
+		 *
+		 * WARNING ... if you do this after the workmarker has been
+		 *  processed, there will no longer be any matching shares,
+		 *  sharesummaries or workmarkers in ram, so you'd need to
+		 *  restart ckdb to regenerate the markersummaries
+		 *  HOWEVER, ckdb wont reload the shares if there is a later
+		 *  workmarker that is processed
+		 *
+		 * SS_to_MS will complain if any markersummaries already exist
+		 *  when processing a workmarker
+		 * Normally you would use 'processed' if the markersummaries
+		 *  are OK, and just the workmarker failed to be updated to
+		 *  processed status
+		 * However, if there is actually something wrong with the
+		 *  shift data (markersummaries) you can delete them and they
+		 *  will be regenerated
+		 *  This will usually only work as expected if the last
+		 *   workmarker isn't marked as processed, but somehow there
+		 *   are markersummaries for it in the DB, thus the reload
+		 *   will reload all the shares for the workmarker then it
+		 *   will print a warning every 13s on the console saying
+		 *   that it can't process the workmarker
+		 *   In this case you would cancel the workmarker then ckdb
+		 *    will regenerate it from the shares/sharesummaries in ram
+		 *
+		 * Requires markerid */
+		i_markerid = require_name(trf_root, "markerid", 1, (char *)intpatt, reply, siz);
+		if (!i_markerid)
+			return strdup(reply);
+		TXT_TO_BIGINT("markerid", transfer_data(i_markerid), markerid);
+		K_RLOCK(workmarkers_free);
+		wm_item = find_workmarkerid(markerid, true, '\0');
+		K_RUNLOCK(workmarkers_free);
+		if (!wm_item) {
+			snprintf(reply, siz,
+				 "unknown workmarkers with markerid %"PRId64, markerid);
+			return strdup(reply);
+		}
+		DATA_WORKMARKERS(workmarkers, wm_item);
+		if (WMPROCESSED(workmarkers->status)) {
+			snprintf(reply, siz,
+				 "can't cancel a processed markerid %"PRId64,
+				 markerid);
+			return strdup(reply);
+		}
+
+		ok = delete_markersummaries(NULL, workmarkers);
+		if (!ok) {
+			snprintf(reply, siz, "%s failed", action);
+			LOGERR("%s.%s", id, reply);
+			return strdup(reply);
+		}
 	} else {
 		snprintf(reply, siz, "unknown action '%s'", action);
 		LOGERR("%s.%s", id, reply);
diff --git a/src/ckdb_dbio.c b/src/ckdb_dbio.c
index ffd858e9..fd790a13 100644
--- a/src/ckdb_dbio.c
+++ b/src/ckdb_dbio.c
@@ -3567,7 +3567,7 @@ bool sharesummaries_to_markersummaries(PGconn *conn, WORKMARKERS *workmarkers,
 				       K_TREE *trf_root)
 {
 	// shorter name for log messages
-	const char *shortname = "SS_to_MS";
+	static const char *shortname = "SS_to_MS";
 	ExecStatusType rescode;
 	PGresult *res;
 	K_TREE_CTX ss_ctx[1], ms_ctx[1];
@@ -3613,6 +3613,14 @@ bool sharesummaries_to_markersummaries(PGconn *conn, WORKMARKERS *workmarkers,
 	K_RUNLOCK(markersummary_free);
 	DATA_MARKERSUMMARY_NULL(markersummary, ms_item);
 	if (ms_item && markersummary->markerid == workmarkers->markerid) {
+		/* The fix here is either to set the workmarker as processed
+		 *  with the marks action=processed
+		 *  if the markersummaries are OK but the workmarker failed to
+		 *  have it's status set to processed
+		 * OR
+		 *  delete the markersummaries with the marks action=cancel
+		 *  so this will continue and regenerate the markersummaries
+		 */
 		reason = "markersummaries already exist";
 		goto flail;
 	}
@@ -3853,6 +3861,162 @@ flail:
 	return ok;
 }
 
+bool delete_markersummaries(PGconn *conn, WORKMARKERS *wm)
+{
+	// shorter name for log messages
+	static const char *shortname = "DEL_MS";
+	K_STORE *del_markersummary_store = NULL;
+	ExecStatusType rescode;
+	PGresult *res;
+	K_TREE_CTX ms_ctx[1];
+	MARKERSUMMARY *markersummary = NULL, lookmarkersummary;
+	K_ITEM *ms_item, ms_look, *p_ms_item = NULL;
+	bool ok = false, conned = false;
+	int64_t diffacc, shareacc;
+	char *reason = "unknown";
+	int ms_count;
+	char *params[1];
+	int par = 0, ms_del = 0;
+	char *del, *tuples = NULL;
+
+	if (WMPROCESSED(wm->status)) {
+		reason = "status processed";
+		goto flail;
+	}
+
+	LOGWARNING("%s() Deleting: markersummaries for workmarkers "
+		   "%"PRId64"/%s/End %"PRId64"/Stt %"PRId64"/%s/%s",
+		   shortname, wm->markerid, wm->poolinstance,
+		   wm->workinfoidend, wm->workinfoidstart, wm->description,
+		   wm->status);
+
+	del_markersummary_store = k_new_store(markersummary_free);
+
+	lookmarkersummary.markerid = wm->markerid;
+	lookmarkersummary.userid = 0;
+	lookmarkersummary.workername = EMPTY;
+
+	ms_count = diffacc = shareacc = 0;
+	ms_item = NULL;
+
+	INIT_MARKERSUMMARY(&ms_look);
+	ms_look.data = (void *)(&lookmarkersummary);
+
+	K_WLOCK(workmarkers_free);
+	K_WLOCK(markersummary_free);
+
+	ms_item = find_after_in_ktree(markersummary_root, &ms_look, ms_ctx);
+	DATA_MARKERSUMMARY_NULL(markersummary, ms_item);
+	if (!ms_item || markersummary->markerid != wm->markerid) {
+		reason = "no markersummaries";
+		goto flail;
+	}
+
+	// Build the delete list of markersummaries
+	while (ms_item && markersummary->markerid == wm->markerid) {
+		ms_count++;
+		diffacc += markersummary->diffacc;
+		shareacc += markersummary->shareacc;
+
+		k_unlink_item(markersummary_store, ms_item);
+		k_add_tail(del_markersummary_store, ms_item);
+
+		ms_item = next_in_ktree(ms_ctx);
+		DATA_MARKERSUMMARY_NULL(markersummary, ms_item);
+	}
+
+	par = 0;
+	params[par++] = bigint_to_buf(wm->markerid, NULL, 0);
+	PARCHK(par, params);
+
+	del = "delete from markersummary where markerid=$1";
+
+	if (conn == NULL) {
+		conn = dbconnect();
+		conned = true;
+	}
+
+	res = PQexecParams(conn, del, par, NULL, (const char **)params, NULL, NULL, 0, CKPQ_WRITE);
+	rescode = PQresultStatus(res);
+	if (!PGOK(rescode)) {
+		PGLOGERR("Delete", rescode, conn);
+		reason = "db error";
+		goto unparam;
+	}
+
+	if (PGOK(rescode)) {
+		tuples = PQcmdTuples(res);
+		if (tuples && *tuples) {
+			ms_del = atoi(tuples);
+			if (ms_del != ms_count) {
+				LOGERR("%s() deleted markersummaries should be"
+					" %d but deleted=%d",
+					shortname, ms_count, ms_del);
+				reason = "del mismatch";
+				goto unparam;
+			}
+		}
+	}
+
+	ok = true;
+unparam:
+	PQclear(res);
+flail:
+	if (conned)
+		PQfinish(conn);
+
+	if (!ok) {
+		if (del_markersummary_store && del_markersummary_store->count) {
+			k_list_transfer_to_head(del_markersummary_store,
+						markersummary_store);
+		}
+	} else {
+		/* TODO: add a list garbage collection thread so as to not
+		 *  invalidate the data immediately (free_*), rather after
+		 *  some delay */
+		ms_item = del_markersummary_store->head;
+		while (ms_item) {
+			remove_from_ktree(markersummary_root, ms_item);
+			remove_from_ktree(markersummary_userid_root, ms_item);
+			free_markersummary_data(ms_item);
+			ms_item = ms_item->next;
+		}
+
+		k_list_transfer_to_head(del_markersummary_store,
+					markersummary_free);
+
+		p_ms_item = find_markersummary_p(wm->markerid);
+		if (p_ms_item) {
+			remove_from_ktree(markersummary_pool_root, p_ms_item);
+			free_markersummary_data(p_ms_item);
+			k_unlink_item(markersummary_pool_store, p_ms_item);
+			k_add_head(markersummary_free, p_ms_item);
+		}
+	}
+
+	K_WUNLOCK(markersummary_free);
+	K_WUNLOCK(workmarkers_free);
+
+	if (!ok) {
+		// already displayed the full workmarkers detail at the top
+		LOGERR("%s() %s: workmarkers %"PRId64"/%s/%s",
+			shortname, reason, wm->markerid, wm->description,
+			wm->status);
+	} else {
+		LOGWARNING("%s() Deleted: %d ms %"PRId64" shares "
+			   "%"PRId64" diff for workmarkers %"PRId64"/%s/"
+			   "End %"PRId64"/Stt %"PRId64"/%s/%s",
+			   shortname, ms_count, shareacc, diffacc,
+			   wm->markerid, wm->poolinstance, wm->workinfoidend,
+			   wm->workinfoidstart, wm->description, wm->status);
+	}
+
+	if (del_markersummary_store)
+		del_markersummary_store = k_free_store(del_markersummary_store);
+
+	return ok;
+}
+
 static void set_sharesummary_stats(SHARESUMMARY *row, SHARES *s_row,
 				   SHAREERRORS *e_row, bool new,
 				   double *tdf, double *tdl)
@@ -6876,8 +7040,9 @@ bool workmarkers_fill(PGconn *conn)
 		    !WMPROCESSED(row->status)) {
 			LOGWARNING("%s(): WARNING workmarkerid %"PRId64" (%s)"
 				   " wid end %"PRId64" isn't processed! (%s) "
-				   "You should abort ckdb and mark it if it "
-				   "actually has already been processed",
+				   "You need to correct it after the startup "
+				   "completes, with a marks action: processed"
+				   " or cancel",
 				   __func__, row->markerid, row->description,
 				   row->workinfoidend, row->status);
 		}